title: Single center comparison of laparoscopic cryoablation and CT-guided percutaneous cryoablation for renal tumors.
abstract: OBJECTIVE
  Cryoablation has demonstrated therapeutic effectiveness for selected renal tumors. We compared our perioperative and short-term outcomes of laparoscopic (LAP) v percutaneous (PERC) renal cryoablation.
  
  
  METHODS
  Thirty-four patients (18 men/16 women) underwent a LAP and 26 patients (19 men/7 women) underwent a PERC procedure between September1998 and January 2007. LAP cryoablation was performed transperitoneally with ultrasonographic monitoring. PERC cryoablation was performed with CT guidance. Follow-up imaging was obtained at regular intervals.
  
  
  RESULTS
  Mean follow-up was 25 months. Average age (years) was 67.0 for the LAP and 69.7 for the PERC procedure (P = 0.307). Mean body mass index (kg/m(2)) was 29.8 for those undergoing LAP and 28.7 for those undergoing PERC procedures (P = 0.543). Mean tumor size (cm) was 2.9 for LAP patients and 3.1 for PERC patients (P = 0.432). Anterior tumors comprised 61.7% of LAP and 15.4% of PERC procedures (P < 0.001). Posterior tumors comprised 32.4% of LAP and 65.4% of PERC procedures (P = 0.01). Mean procedure time (minutes) was 165.7 for LAP and 106.6 for PERC procedures (P < 0.001). Hospital stay (days) was 2.6 for those undergoing LAP and 1.8 for those undergoing PERC procedures (P < 0.001). Both LAP patients (82.4%) and PERC patients (19.2%) needed postoperative narcotics (P < 0.001). Atelectasis developed in 70.6% of LAP patients and 34.6% of PERC patients (P = 0.005). Residual enhancement was seen in 11.5% of PERC patients and 2.9% of LAP patients (P = 0.192). Complications developed in 14.7% of LAP patients and 26.9% of PERC patients (P = 0.248). 1-year, 2-year, and 3-year disease-specific survival for the two groups was 100%. Tumor size > 4 cm and endophytic location were significantly associated with residual enhancement.
  
  
  CONCLUSIONS
  LAP and PERC renal cryoablation have similar short-term outcomes. Significantly more anterior tumors were approached laparoscopically and significantly more posterior tumors were approached percutaneously. The PERC approach may offer advantages regarding hospital stay, narcotic need, and development of atelectasis. Longer-term data are needed to establish success of this approach.
authors.affiliation: Department of Urology, Department of Diagnostic Radiology, University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA. iderweesh@gmail.com
authors.forename: Ithaar H
authors.initials: IH
authors.lastname: Derweesh
authors.forename: John B
authors.initials: JB
authors.lastname: Malcolm
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Diblasio
authors.forename: Andrew
authors.initials: A
authors.lastname: Giem
authors.forename: John C
authors.initials: JC
authors.lastname: Rewcastle
authors.forename: Robert W
authors.initials: RW
authors.lastname: Wake
authors.forename: Anthony L
authors.initials: AL
authors.lastname: Patterson
authors.forename: Robert
authors.initials: R
authors.lastname: Gold
mesh_terms: D000368:Aged; D003452:Cryosurgery / Q000379:methods*; D003710:Demography; D005260:Female; D006761:Hospitals; D006801:Humans; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging / Q000601:surgery*; D010535:Laparoscopy / Q000379:methods*; D008297:Male; D019990:Perioperative Care; D011183:Postoperative Complications; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome